Liquid dividing and dispensing system



Dec. 16, 1941. 1 E. J. HULL 2,266,204

LIQUID DIVIDING AND vDISYPENSING: SYSTEM 2 Sheets-Sheet 1 I Q INVENTOR.

70W/M cl ffl/l L.

ATTORNEY.

Similarly, piston rod I5 has an enlarged hub 3| with grooves 33 and 35on either side. Next to the grooves 33 and 35 are the piston valves 3land 39. Located near the ends of piston rod I5 are the pistons or pumpplungers 4| and 43 which t in the end pump chambers respectively ofcylinder 5.

Cylinder 3 is provided with dual service or end ports 45 and 4lrespectively at each end thereof and cylinder 5 is similarly providedwith dual service or end ports 49 and 5|.

The ends of both piston rods |3 and I5 project beyond the pistons orpump plungers so as to prevent the closing of the dual service ports.Any other suitable abutment may be provided for permitting ow of fluidinto the end chamber when the associated piston is at the outer end ofits stroke. Y

A central passage 53 connects the central portions of cylinders 3 and 5.In this passage I preferably locate control means cooperating with thehub and grocved portions of the two piston assemblies to preventsimultaneous movement of said rods. It is evident that the hubs |1 andI9 could be located elsewhere and a separate passage could be providedfor the means for preventing simultaneous movement o the piston rods,but for economy and compactness I prefer to locate them as shown.

It has been the practice to provide a pin to act as a stop member and toprevent simultaneous movement of two such valves, but it has been foundthat great wear takes place on the contacting heads of said pin type ofstop member. I have therefore provided two balls 55 and 5l for contacts,using a small spacer 59 between them, the overall length of the ballsand spacer being greater than that of the passage 53 in which they areadapted to operate. The balls give a rolling contact and assure longerlife to the device. The diameter of each of the balls 55 and 5l as Wellas that of the spacers 59, in this embodiment, is less than that of thepassage 53, as fluid must be able to pass through the passage 53 at alltimes that the device is in operation; The control balls and spacer areactuated by the movement of the pis-- tons andare not unduly restrainedby gravity.

It is evident that the balls and spacer act als' the pin previouslyacted in conjunction with the hubs and 3| and the adjacent grooves ofthe respective piston rods in forming a control mechanism which preventsthe piston rods from moving at the same time, thereby avoiding failureof operation which might otherwise result if the fluid pressure shouldbe discontinued while the piston rods were passing dead center or ifthey got in that position when the device was not in operation as byaction of gravity or vibration for example.

Adjacent the central portion of each cylinder, two additional dualservice ports are also provided in each cylinder, 69 and 19 in cylinder5 and 89 and 99 in cylinder 3. It will be noticed that said ports arelocated in such spaced relation that the piston valves on each side ofeach associated piston hub are adapted to establish conductiveconnection between one or the other of said end dual service ports inYeither cylinder and one or the other of the centrally located dualservice ports in the other cylinder. For this reason, these four dualservice ports 69, 19, 89 and 99 are also called control ports. Thisarangement of the ports and piston valves in the lower cylinder 5 servesto pass fluid from sci . port |03.

.3) with dual service port 69 (located near and to the right of inletport |I in cylinder 5). Circuit pipe line 1| -connects dual service orend port 4l (located at the left of cylinder 3) with dual service port'|9 (located near and to the leftof inlet port in cylinder 5). Circuitpipe line 8| connects dual service or end port 49 (located at the rightof cylinder 5) with dual service Vport 89 (located near and to the leftof the opening of passage 53 into cylinder 3).

Circuit pipe line 9| connects dual service or end port 5| (located atthe left of cylinder 5) with dual service port 99 (located near and tothe.

right of the opening of passage 53 into cylinder 3).

Each of the pipe lines which interconnect between the dual service portsof the device also may have connected therein a reversible feeder of thenature shown in the U. S. Patent Number 1,997,406 issued to David R.Hillis on April 9, 1935, or any number thereof in series. Also only suchlines as it may be desired to usefor dispensing liquid may be providedwith reversi- 35- b le feeders.

I have shownv each line as having a series of twoffeedersjthe line 6|having feeders 63 and 6l each having a discharge pipe line'65 connectedthereto; the line having feeders l13 and 'Il each having a dischargepipe line 15 leading therefrom; the line 8| having feeders 83 and 8'IVeach having a discharge pipe line 85 leading-therefrom; theline 9|having feeders 45,; 93 and 9'| *each having ra discharge pipe line 95'leading therefrom.

- Two exhaust passages |0| and |93, lead from cylinder 3, being sospaced that, when piston rodVK I3 is at its extreme left position, dualservice port 99 may communicate with exhaust passage |03, fluid flowingthrough said port 99 from pipe line 9| may then pass around the reducedportion of piston rod |3 between piston valves 23 and 21 and pass out ofthe exhaust Similarly when piston rod I3 is at its extreme rightposition, iluid coming into cylinder 3 from pipe line 8|, through dualservice port 89, will pass around reduced portion of piston rod I3,between piston valves 25 and 29, and thence pass out of the exhaust port|9|.

Similarly spaced exhaust passages IIa and |93a. also lead from cylinder5 to cylinderV 3 for exhausting vfluid that returns through pipe lines'Il and 6| respectively toV cylinder 5, said fluid being passed to therespective exhaust portions of cylinder 3 and its respective exhaustports |9| and |03 which are connected to piping |95 leading to areservoir or the pump sump.

Cnthe right hand end of piston rod I5 I have provided`an indicator rod|09 which extends through the nut 9, the nut being provided with theusual packing. Of course a plurality otindicator rods could beprovidedbut as long as the workman in attendance sees one indicatormove, -he knows that the device is still operating satisfactorily.

(Iteration A source of uidunder pressure is connected to the inlet portII. For instance, a pump may be connected directly or by a pipe line IIIto the inlet port Il. Well-known relief Valves are used for exhaustingair and filling the system. Hence let us assume the system is lled withgrease hfor lubricating bearings connected to the discharge pipesleading frorn the respective feeders and assume that the parts are inthe positions shown in Fig, l.

Grease will then pass around hub 3| in cylinder and out of dual serviceport 19, into pipe circuit l|, discharge a measured quantity of greasefrom feeder 71, out of discharge pipe v15, then by-pass and through thecontinuation of pipe line 1| leading to feeder 13, discharge a measuredquantity of grease from lfeeder 13 and pass en through the remainder efpire `line 1l, through dual service port 41 and into the left hand Asideof cylinder 3, causing piston rod I3 to shift to the right.

It should be noted that while the passage 53 is open at all times,grease will not pass therethrough while the'above operation is takingplace las the passage 53 and the portion of cylinder 3 between pistonvalves 23 and 25 and the dual service port 89 and pipe line 8| with itsfeeders 81 and 83 have just previously functioned to shift pistonassembly l5 to the left, and inlet pressure is now holding the same inits extreme left position.

`When the grease has completed its circuit through pipe line '|I fromdual service port 19 to dual service port 41, it then shifts piston rodI3 to the right, forcing the balls 55 and 51 and the spacer 59downwardly in passage 53, so that ball 51 will rest in groove'33, asshown in Fig. 2, thus preventing piston rod I5 from movingsimultaneously therewith, as itsfluid holding pressure is now relieved.

The grease in the right hand chamber of cylinder 3 is now discharged asby the pumping action of plunger 21. It then passes through dual serviceport 45 into pipe line 6|, operates feeders 63 and 51 and enterscylinder 5 through dual service port 69, passing around reduced portionof piston rod I5, between piston valve 31 and piston 4|, from whence itis free to exhaust through passage ||J3a into cylinder 3, between pistonvalve 23 and piston 21, which always are in position to open to exhaustpassage I 03, thence through pipe line |95 to the' reservoir or sump ofa pump. Y

Piston rod |3 is now `held in its right hand position, as shown in Fig.2, by the pressure of the grease entering the inlet port. Thispressesthegrease in line '|I against the piston 29 of piston rod I3 until thepressure 'later is relieved by movement of pistenrod I5 to the right, atwhich time ball 55 Wili be forced into groove 2| to hold piston rod I5.

After piston rod I3 has moved to the right, as seen in Fig. 2, greasewill then pass from the inlet port through passage 53 and around hub I?in cylinder 3 and out thereof through dual service port 99, into vpipeline 9|, operate feeders 9`| and 93 and pass through dual service port5| into the left end chamber of cylinder 5,

forcing piston rod I5 to the right, which action70 forces the balls andspacer up to the position shown in Fig. 3.

The movement of piston rod I5 to the right alsov causes piston 4I tedischarge the grease from the right hand chamber `of cylinder 5,

through dual servceport 49, pipe line 8|, Voperating ,feeders 83 and.87,and the balance of said discharged'grease, beyond that of thecapacity of feeders 83 and |31, displaces a like quantity of grease inthe line, causing it to reenter cylinder 3 through dual service port B9and to dis-` charge into the exhaust, through exhaust port IBI, a likeamount.

After both pistons have arrived at the right, as shownin Fig. 3, greasenow ows from inlet port II into cylinder 5, around hub 3| and out dualservice port 69 into pipe line 3|, operating feeders 67 and 63 andentering into the right hand en d of cylinder 3, ,through` dual serviceport 45, forcing piston rod |3 to the left. This action forces the ballsdown as shownin Fig. 4 and also displaces the grease in the chamber atthe left end of cylinder 3, causing flow of grease out of dual serviceport 41, through pipe line '|I, `operating feeders '|3 and 'I1 and intocylinder 5, through dual service portr 19 which then registers with thatportion of piston rod I5 between piston valve 39 and piston 43 thatregisters with exhaust passage I9 lafhence it may exhaust throughpassage I Bla and through cylinder 3 between piston valve 2,5 and piston29 and exhaust port Ill and exhaust pipe line I 95.

Grease now passes from inlet por-t II through the centralportion ofcylinder 5 and passage 53 into central portion ofcylinder 3, around huband outof dual service port 89 into pipe line 8|, operating feeders 81and .8 3 and passing through dual service port li9 into the right handchamber of cylinder 5, forcingpiston rod I5 to the left. This forces theballs to the position shown in Fig. l and displaces the grease in thechamber at the left of cylinder 5, causing flow of grease in pipe line9|, operating feeders 93 and 9iY and passing through dual service port99 into cylinf der 3 between piston valve 23 andpiston 27 from whence itis free to exhaust through exhaust port |93.

Y Care should be taken tosee that the capacity of the total number offeeders connected to any one line is less thanthe capacity of the`chamber at the end of any cylinder which discharges through the line..e v

Aside Vfron/ 1 the specic embodiment of .the invention herein shownranddescribed, it will be understood that numerous details of the con:`SiTuQtOn may be altered or omitted without de: parting from the.Spiritand scope .0f the inven.-l tion as disclosed and claimed, andthat I .do not desire to limit the invention to the .exact constructionherein set forth.

I claim:V

l. A dispensing ,System iomprising. a plurality of conduits, eachconduit being provided with a, reversiblv operated dispensing andbyfpassing feeder, a body having. .a plurality of dual service' ports,each end of each of said conduits being CQIineied te .a @dieren-tone ofsaid `dual service ports in the` body so that each conduit forms.

a Circuit leading from .and returning te said Y body, an inlet portinfsaid 'body adapted to ref ceive fluid under pressure, exhaust portmeans in said body, uid flow conducting passages in said bodyconductively connecting between said inlet por-t, dual service ports andsaid exhaust port means, and two movable members in said body operableby said duid under pressure in said inlet port in cooperation with eachother and with said passages and ports to reverse the direction `of flowof fluid in said conduits in time-sequence relation. Y

2. A dispensing system comprising, a plurality of conduits, each conduitbeing provided with a dispensing and by-passing feeder, a body having aplurality of dual service ports, each end of each of said conduits beingconnected to a different one of said dual service ports so that eachconduit forms a circuit leading from and returning to said body, aninlet port in said body adapted to receive fluid under pressure, exhaustports in said body, fluid flow conducting passages in said bodyconductively connecting between said inlet port, said dual serviceports, and said exhaust ports, and movable means in said body fordirecting uid through each of said conduits in time sequence relation,said movable means being operable by said fluid under pressure andadapted, in cooperation with said passages and ports, to reverse thedirection of flow of fluid in said conduits.

3. A dispensing system comprising, a plurality of conduits, each conduitbeing provided with a dispensing and by-passing feeder, a body having apair of cylinders, a plurality of dual service ports in said body, halfof them opening into and leading from each cylinder, each end of each ofsaid conduits being connected to a different one of said dual serviceports so that each conduit forms a circuit leading from and returning tosaid body, an inlet port in said body opening into the central portionof each cylinder adapted to receive fluid under pressure, pistonassemblies in each of said cylinders operable by said fluid underpressure in passing through the system for controlling and reversing thedirection of ilcw of fluid in said conduits in time sequence relation,and exhaust outlets for exhausting returned fluid which has not beendispensed.

4. In combination in a system for dividing and distributing uids, a bodyhaving a pair of cylinders closed at the ends, a reciprocating pistonassembly slidably disposed in each cylinder including a piston rod andtwo pistons near the outer end and two spaced piston Valves near themiddle portion of said rod, said pistons and piston valves fitting thecylinders in fluid retaining relation and spaced apart by portions ofsmaller diameter of said rod, providing fluid receiving and passingspaces between, one of said fluid receiving spaces being disposed at thecentral portion of each piston assembly, each said piston assemblyhaving two outer spaces, a central passage in the body connectingbetween said central spaces, an inlet port in said body opening into thecentral space of one of the piston assemblies and connecting to thecentral space of the other piston assembly for admitting high pressurefluid therein, each cylinder having an end port adjacent each end forapplying fluid pressure on the end of the adjacent piston for moving thepiston assembly to the other end of the cylinder, four control ports,two in each cylinder spaced on each side of the center thereof, saidports being opened and closed by the movements of the piston assembliesand so arranged that each assembly controls the application of fluidpressures selectively on the ends of the other piston assembly to moveboth piston assemblies to and fro as long as fluid pressure is appliedinto said inlet ports, two exhaust port passages opening through theside walls of each cylinder at points on opposite sides of the centerand suiiiciently spaced toward the ends of the cylinders from saidcontrol ports to avoid being connected with the central space of thepiston assembly in either position thereof and to connect with the outerspace of each assembly when it is moved toward the center of thecylinders, four control conduit lines, one connecting from each controlport and extending externally of said body and returning to said bodyconnected into one of said end ports for applying actuating fluidpressures therein, and a fluid measuring, dispensing and by-passingfeeder disposed in one or more of said control lines -for operation tomeasure and dispense a portion of the control fluid received from itsline and adapted-to by-pass additional fluid to the continuation of itsline.

5.` In combination in a system for dividing and distributing iiuids, abody having a pair of cylindersclosed at the ends, a reciprocatingpiston assembly slida'bly disposed in each cylinder, each pistonassembly including a rod and two piston valves spaced'on opposite sidesof and adjacent the center and two pistons spaced adjacent the oppositeends, said pistons and piston valves tting the cylinders in fluidretaining relation and being spaced apart for providing fluid receivingand passing spaces between, one of said fluid receiving spaces beingdisposed'at the central portion of each piston assembly, a centralpassage connecting between said central spaces, two exhaust portsconnecting through the side Walls of each cylinder and suitablypositioned for connecting the space between the piston valve and thepiston at each end of each piston assembly with the corresponding spacein the other piston assembly in all movable positions of both pistonassemblies, an inlet port in said body opening into the central space ofone of the piston assemblies for admitting high pressure fluid therein,each cylinder having an end port adjacent each end for applying ,iiuidpressure on the end of the adjacent piston for moving the pistonassembly to the other end of the cylinder, control ports opened andclosed by the movements of the piston assemblies and so arranged thateach assembly controls the application of uid pressures selectively onthe ends of the other piston assembly to move both piston assemblies toand fro as long as fluid pressure is applied into said inlet ports,control conduit lines connecting one from each control port andextending externally of said body and returning tosaid body connectedinto one of said endports for applying actuating uid pressures therein,and a iiuid dispensing feeder disposed in one or more of said controllines for operation to dispense a portion of the control iiuid which ispassed through said control conduit line for actuating said pistonassemblies.

6. In combination in a system for dividing-and distributing fluids, abodyhaving a pair of guide cylinders therein, a reciprocating piston rodin each cylinder, a pair of pistons on each rod adjacent the outer endsthereof, a pair of piston valves on each rod near the mid-portionthereof,`

said piston valves being spaced apart and also spaced from the pistonsto provide fluid receiving spaces therebetween; an inlet port in saidbody connecting into the space between two of said piston valves in onecylinder and connecting into the corresponding space in the othercylinder for receiving high pressure uid therein, exhaust passages insaid body opening one from each space between each piston valve and eachpiston of each cylinder, dual service ports suitably positioned in saidcylinder and interconnecting control conduits connecting from andbetween the dual service ports of said cylinders to cause saidpistonassemblies to ,reciprocate continuously in response-to fluid injected'under pres- `fluid in reversing flow relation in said conduits,

said control conduits extendingfexternally of said body, and afluid'dispensing feeder device disposed in one or more of said-controllines for operation to dispense a portion of the control uid passingtherethrough. Y

'7. In combination in a system for dividing and distributing fluids, a-body having a pair of cylinders closed at the ends, a reciprocatingpiston assembly slida-bly disposed in-each cylinder, each' pistonassembly including a piston rod having two piston valves near themid-portion thereof and two pistons, one adjacent each end thereof, saidvalves and pistons .tting'the cylinders in duid retaining relation andAsaid valves being spaced apart and alsospaced from the pistons tovprovide iiuid receiving and passing spaces therebetween, one of saidfluid .receiving spaces being disposed at the central portionof 'eachpiston assembly, a central passage connecting'between said centralspaces, control means in said central passage actuable by either pistonassembly .moving from an extreme position to secure the otherpistonassembly in an extreme position until the other has reached an extremeposition, an inlet port in said body opening-into the central space ofone of the piston assemblies .for admitting high pressure fluid therein,each cylinder having an end `port adjacent each enjd' for applying fluidpressure on the end of the ad.- `ia-cent piston for moving the pistonassembly to the other end of the cylinder, four control ports opened andclosed by the movementsof the piston assemblies and so arranged thateach assembly controls the application of fluid pressures selectively onth'e ends of the other piston assembly Yto move both piston assembliesto and fro as long as fluid pressure is applied into said inlet port,four control conduit lines connecting one from each control port andextending externally of said body and returning to said body connectedinto one of said end ports for applying actuating uid pressures therein,a reversibly operable fluid dispensing feeder disposed in one or more ofsaid control lines for operation to dispense a portion ofthe con-trolfiuid passed therethrough, exhaust ports in said body opening from theuid receiving spaces between the piston valves and the pistons, spacedapart on opposite sides of' the center of each piston assembly, andfluid conducting lines connecting from respective ones of said exhaustports adapted for returning some of the distributing fluid to areservoir or sump of a pump.

8. An apparatus for dividing and distributing fluids comprising, a bodyhaving two cylinders closed at the ends, a piston assembly slidablydisposed in each cylinder, eachi piston assembly including two pistonvalves and two pistons sliding in uid retaining relation in the cylinderand rigidly spaced apart with the two piston valves on each side of thecenter of the assembly providing uid receiving spaces between saidpiston valves and the pistons being spaced outwardly therefrom andproviding intervening spaces, each cylinder having a dual service endport adjacent each end for receiving fluid under pressure to apply onthe adjacent end of the adjacent piston for moving the piston assemblyto the other end of the cylinder and for discharging fluid therefromwhen pressure is applied on the other end of the piston assembly,additional dual service ports, one complementary to and .5 cooperatingwith eaehlof said Send .ports Aand opening through an intermediateportion .of fthe rotherclylinder side wall for vcontrol blyv an innerpiston Ivalveof zthe piston assembly therein, four conduits, `oneconnecting each dual service end port .to its complementary dual servicecon-trol port, a vreversibly operable Vand ley-passing feeder connectedto each conduit, .an inlet port rin .said lbodyopening into- :eachcylinder at the .cen-

tral space of .each of the pistonassemblies, two exhaust passages:connecting between the two cylinders :and .opening intov the spacesbetween .the valve pistons 1and the :pistons of each assembly,andzexhaust passages connecting and opening therefrom ,for exhaustingundistributed fluid returning A`to' .the apparatus.

.9. Apparatus for distributing fluids comprising, .a body member havinga pair of cylinders therein, a reciprocating piston'rod in eachcylinder, a pair of pistonsfon each rod adjacent the outer ends thereof,a pair of piston valves on each' rod near the mid-portion thereof, saidpiston valves vbeing spaced apa-rt and also spaced `lfrom the pistons,to provide fluid receiving spaces therebetween, an inlet Vport in saidbody connecting into each cylinderfat the space between t-woof saidpiston valves for receiving high pressure duid therein, ,ports suitablypositioned Vin said cylinders in cooperative relation to said pistonsand piston valves, interconnecting conduits connecting from and betweenthe ports in said cylinders to cause said piston assemblies toreciprocate :continuously in .response t0 fluid i11- 'ieted under.pressure into .Said inlet port, 011e of said conduits `vbeing adaptedfor connection to ya reversibly operable dispensing and by-passingfeeder, two spaced vexhaust passages connecting through the body betweenthe spaces between each adjacent piston valve and piston, and .exhaustpassages connecting and opening therefrom. Y p

1.0. Apparatus for distributing fluids including thecombination setfOIth in claim number -6 and .also having-.means forpreventingmovementof both piston rods at the same time.

11. A uid dispensing Vsystem comprising, a body having a cylindertherein, four dual service ports in said body opening into said cylinderat axially spaced points, one at each end thereof and one on each sideof the center thereof, another cylinder in said body, four dual serviceports in said body opening similarly into said second mentioned cylinderand corresponding in position to the ports opening into the rstcylinder, four conduits, each conduit connecting from one of the dualservice end ports of one cylinder to one of the dual service ports inthe mid-portion of the other cylinder, an inlet port in said bodyopening into said cylinders to receive uid under pressure th'erein,piston assemblies in each of said cylinders opera-ble by the uid underpressure in passing through the system for reversing the direction offlow of uid in said conduits, exhaust ports opening from the cylindersfor exhausting some of the returned fluid, a fluid dispensing andby-passing feeder disposed in at least one of said conduits foroperation by the uid passing reversely therethrough, and exhaustpassages leading from said exhaust po-rts for exhausting undispensedfluid returning to said cylinders from said conduits.

12. A iiuid distributing system comprising, a body, a plurality ofcylinders in said body, a plurality of ports opening into each of saidcylinders at corresponding similar points, some being adjacent the endsthereof and others being spaced intermediate the ends of the cylinders,conduits connecting the ends of each cylinder into another cylinder, aninlet port in said body for receiving fluid under pressure therein,conduit means connecting each cylinder to the inlet port for the flow offluid through all the cylinders, a piston assembly in each cylinderarranged to be automatically shifted back and forth between two extremepositions by the fluid under pressure, each piston assembly havingspaced pistons and piston valve means so spaced and positioned relativeto said ports as to alternately connect the ends of the cylinders tofluid under pressure and to alternately connect the cylinders at theiropposite ends to outlets in other cylinders through said conduit meanswhereby said piston assemblies continuously reciprocate to dischargeiiuid from opposite ends thereof so long as fluid under pressure isprovided, one or more of said conduit means consisting of a pipe orpipes extending externally of said body, fluid dispensing and by-passingfeeders connected into such external pipeV or pipes for operation by thefluid passing reversely therethrough, two exhaust passages connectingbetween the two cylinders and opening into the spaces between the valvepistons and the pistons of each assembly, and exhaust passagesconnecting and opening therefrom for exhausting undistributed fluidreturring to the apparatus.

13. A iiuid dispensing system, comprising, a body having a plurality ofcylinders therein, eight dual service ports in said body, four of saiddual service ports opening into each cylinder, one at each end thereofand one on each side of the center thereof, an inlet port in said bodyopening into said cylinders to receive fluid under pressure therein,four conduits, each conduit leading from one of the dual service endports of one cylinder` to one of the dual service ports in themid-portion o f the other cylinder, piston assemblies in each ofsaidcylinders operable by the uid under pressure inpassing through thesystem for reversing the direction of flow of fluid in said conduits,exhaust ports opening from the cylinders for exhausting some of thereturned fluid, and a fluid dispensing and by-passing feeder disposed inat least one of said conduits for operation by the fluid passingreversely therethrough.

14. A fluid distributing system comprising, a. body, a plurality ofcylinders in substantially parallel relation in said body, each end ofeach cylinder being internally threaded, the ends of the cylindershaving threaded members therein, a plurality of ports opening into eachof said cylinders at corresponding similar points, some being adjacentthe ends thereof and others being spaced intermediate the ends of thecylinders, conduits connecting the ends of each cylinder into anothercylinder, an inlet port in said body for receiving iiuid under pressuretherein, conduit means connecting all the cylinders continuously to theinlet port for the iiow of fluid through all the cylinders, a pistonassembly in each cylinder arranged to be automatically shifted back andforth by the fluid under pressure, each piston assembly having spacedpistons and intermediate piston valve means so positioned relative tosaid ports as to alternately connect the ends of the cylinders to iiuidunder pressure and to alternately connect the cylinders at theiropposite ends to outlets in other cylinders through said conduit meanswhereby said piston assemblies continuously reciprocate to dischargefluid from opposite ends thereof so long as iiuid under pressure isprovided, some of said conduit means consisting of pipes extendingexternally of said body, fluid dispensing and by-passing feedersconnected into some of the external pipes; for operation by the fluidpassing reversely therethrough, and exhaust passages connecting betweenand opening into `the two cylinders into the spaces between the Valvepistons and the pistons on each piston assembly for exhausting fluidtherefrom.

EDWIN J. HULL.

